getter

[get-er]
noun
1.
a person or thing that gets.
2.
any substance introduced into a partial vacuum, as the interior of a vacuum tube or an incandescent lamp, to combine chemically with the residual gas in order to increase the vacuum.
3.
Chiefly Canadian. poisoned bait used to exterminate wolves, gophers, and other pests from farm areas.

Origin:
1325–75; Middle English; see get, -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
getter (ˈɡɛtə)
 
n
1.  a person or thing that gets
2.  a substance, usually a metal such as titanium, evaporated onto the walls of a vacuum tube, vessel, etc, to adsorb the residual gas and lower the pressure
 
vb
3.  (tr) to remove (a gas) by the action of a getter

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Example sentences
The receivers include an evaporable barium getter that is used to monitor the vacuum in the receiver.
We our a nation in debt, no use in getter even further but misrepresentation, and loopholes in small print.
The metal is a getter in vacuum tubes, to remove the last traces of oxygen.
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